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    <script>
        console.log(20-10);
        console.log(20*10);
        console.log(20/10);
        console.log(20%3);

        // 赋值运算符
        /**
         * = += -= *= /= %=
         * 
        */

        // 比较运算符
        /**
         * > < >= <= ==  === != !==
         * 
        */

        /**
         * 逻辑运算符
         * &&  ||  ！
         * 
        */

        /**
         * 自增++ 自减-- 
         * 
         * 前置 先改变变量的值 后置
         * 
         * 
        */

    </script>

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